Pivotal mounting



A A. TIRRILL.

' PIVOTAL MOUNTING. APPLICATION HLED AUG. I1 1917.

1,392,234. Pmn e epu 27,1921;

INVENTOR WITNESSES A/leg 24. Wrr/Y/ a ATTORNEY res RATE "OFF-ICE,

ALLEN-ALTIRHLL;jdrrlrrsnunen,miNNsyLvaNm, AssIGNoR TO wnsrmenousr.

.nmcrmc ZAND mnmcrmnme COMPANY, AQQRPORATION or PENNSYLVANIA.

PIVQTAL MoUN'r NG.

" Specification ofLetters' Patent.

PatentedSeptil27, 1921.

' naus a n eaau us 11,1917, serial o. isl,'7aa

, Mountings, of which the following is a specia durable and economical pivotal mounting fication. j a

My ln'vention (relates to, pivotal mountings' for vibratory'members, such as the armatures of electrical relays and similar de-' vices, and it has for its object to provide for such members.

Considerable difiieu-lty hashe-retofore been.

experienced with thepivot pins and bearings of the armatures of electrical relays and similar devices on accountof wear resulting from rapid and continuous vibration of the armatures. Frequent renewal and adjustment of the parts has accordingly been re-' quired, and it is the object of the present invention to provide a mounting which shall not be subject to wear and shall, therefore, not require replacement and adjustment of the parts.

My invention is illustrated in the accompanying drawing, Figure 1 of which is a view, in side elevation, of an electrical relay embodying my invention; Fig. 2 is a side view of the armature and its mounting; Fig. 3 is a plan view of the armature and its mounting, and Fig. 4 is an end view of the same parts.

My invention is illustrated as employed in connection with an electrical relay comprising a base member 1 which supports the remaining parts, including a U-shaped magnetizable core 2 the legs of which are surrounded by energizing coils 3 and the ends of the legs of which are located adjacent to a flat armature member 4. Attached to one end of the armature 4 is a cross piece 5 that is provided, at each, end, with two seats arranged at right angles to each other for the reception of plate springs 6 and 7 that are riveted, or otherwise attached thereto, the

springs 6 crossing the springs 7 adjacent to the cross-piece 5 and at approximately the pivotal axis of the armature. ends of the springs 6 are secured to the base portion ofa bracket 8 which is, in turn, secured to the base member 1 by means of tap screws 9, the bracket having downwardly The upper and laterally extending arms to the lower ends of which the springs 7 are riveted or otherwise attached.

The mounting of the armature is such I that its vibratory movement occurs around a pivotal axis located approximately on the line of intersectionof the planes of the plate springs 6 and '7, andthe. location of this pivotal axis is substantially invariable because the only movement permitted by the plate springs" is that which tends to subject the springs to a bending moment. The springs not only serve as a pivotal mounting but may also be employed to maintain, or to assist in maintaining, the armature normally out of engagement with the poles of the electromagnet. The movements of the armature are so slight that the springs do not become fatigued in service and the mounting is, therefore, not subject to wear and is permanent.

While my invention is illustrated as employed in connection with the armature of an electrical relay, it is obvious that it may be employed in other relations and for other purposes, and I desire also to have it understood that the invention is not limited in its scope to the specific details of construction illutrated and described.

I claim as my invention:

1. The combination with a movable member, of a pivotal mounting therefor comprising pairs of crossed resilient memberslocated to vibrate in parallel planes and each plate having oneend rigidly attached to the same end of the movable member, and stationary parts to which the other ends of the resilient members are attached, whereby the movable member may effect a movement of rotation relative to the Stationary parts.

2. The combination with a movable mem ber, of a pivotal mounting therefor comprising crossed resilient members each having one end rigidly attached to the movable member adjacent to one end of the pivotal axis, and stationary parts remote from the pivotal axis to which the other ends of the resilient members are rigidly attached.

3. The combination with a movable member, of a pivotal mounting therefor comprising pairs of resilient members each having one end rigidly attached to same end of the movable member and crossing each other at approximately the pivotal axis of the movable member, and stationary parts to which the other ends of the resilient members are rigidly attached.

4. The combination with a movable member, of a pivotal mounting therefor comprising pairs of plate springs located in parallel planes, the springs of each pair of plate springs intersecting each other and each spring having one end rigidly attached to the same end of the movable member, and stationary parts to which the other ends of the springs are rigidly attached, whereby the movable member may effect a movement of rotation relative to thestationary parts. 5. The combination with a movable member, of a pivotal mounting therefor comprising pairs of metal plates arranged to vibrate in parallel planes With their planes intersecting each other and each having one end rigidly attached to the same end of the movable member, and stationary parts to which the other ends of the plates are attached, whereby the movable member may effect a.

movement of rotation relative to the sta-v tionary parts. 7

6. The combination with a movable mem 'ber, of a pivotal mounting therefor comprising a cross-piece upon the movable member, a pair of metal plates at each end of the cross-piece arranged with their planes intersecting each other'and each plate having one end attached to th'er'osspiece, and a bracket to which the other ends of the plates are attached.

7. In an electromagnet, the combination comprising a supporting frame, an armature and means for pivotally mounting the armature on said'frame, said mounting comprising crossed resilient members, the respective ends of said members being attached to one end of the armature and to the supporting frame.

8. In an electromagnet, the combination with an armature, of a pivotal mounting therefor comprising plate springs arranged with their planes intersecting each other and each having one end attached to the armature, and a frame to which the other ends of the springs are attached.

ALLEN A. TIRRILL.

Corrections in Letters Patent No. 1,392,234.

It is hereby certified that in Letters Patent No. 1,3 92 ,234, granted September 27, I921, upon the application of Allen A. Tirrill, of Pittsburgh, Pennsylvania, for an improvement in Pivotal Mountings, errors appear in the printed specification requiring correction as follows: Page 1, line 89, claim 1, strike out the Word plate page 2, line 19, claim 5, after the Word each, second occurrence, insert the Word plate; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the casein the Patent Office Signed and sealed this 29th day of November, A. 1)., 1921.

[SEAL] KARL FENNING,

Acting Commissioner of Patents.

Corrections in Letters Patent No. 1,392,234.

It is hereby certified that in Letters Patent N 0. 1,392,234, granted September 27, 1921, upon the application of Allen A. Tirrill, of Pittsburgh, Pennsylvania, for an improvement in Pivotal Mountings, errors appear in the printed specification requiring correction as follows: Page 1, line 89, claim 1, strike out the Word plate page 2, line 19, claim 5, after the Word each, second occurrence, insert the Word plate; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office,

Signed and sealed this 29th day of November, A. 1)., 1921. I

[SEAL] KARL FENNING,

Acting Commissioner of Patents. 

